Allen Bradley frequency inverter (11.5 kW) repair
The extent to which the device was damaged was visible only when we performed the initial cleaning of dust and burnt out parts. In addition to various parts being burnt out (input filters, input full wave rectifier and IGBT module), and the visible burning out of the printed conductive tracks at the input part due to the intensity of the voltage, an interesting malfunction was found later on…

JEU211A fire alarm repair
The JEU211A fire alarm is of extreme importance to the safety of people in the case of a fire in large buildings, and its repair was a real challenge for our company. Before repairing the device, we noticed that the pressing of the alarm button did not activate the alarm light, no voice could be heard …

SEW Eurodrive 35kW Repair.
The IGBT module in the device was destroyed because the output lines were not properly connected to the motor (human error). The strange thing was that, despite the quick reaction of the fuse, the output IGBT module had still burnt out…

Repair of the frequency inverter for elevators KONE.
The lightning striking the installations of the elevator power supply caused the protective parts in the device to burn out, but also destroyed the IGBT module. The interesting aspect of this repair was that, despite high resistance to voltage, the optocouplers that galvanically separate the power circuits from the electronic, control circuits, were damaged…